Abstract: According to the principle of power keeping constant in the process of cutting, this paper systematically studies the forces performance of cutting edge of ball-end milling cutter and develops a new forces model based on power by strict mathematical means so as to overcome the fault which results from the fact that forces modeling depends mainly on the orthogonal cutting experiments. The experiment results prove that the model presented in this paper can precisely predict the 3D forces of ball-end milling cutter in cutting, and has important engineering value.

Key words: ball-end milling cutter, milling forces, oblique cutting, orthogonal cutting